Bibliometric analysis of the application of deep learning in cancer from 2015 to 2023

Background Recently, the application of deep learning (DL) has made great progress in various fields, especially in cancer research. However, to date, the bibliometric analysis of the application of DL in cancer is scarce. Therefore, this study aimed to explore the research status and hotspots of the application of DL in cancer. Methods We retrieved all articles on the application of DL in cancer from the Web of Science database Core Collection database. Biblioshiny, VOSviewer and CiteSpace were used to perform the bibliometric analysis through analyzing the numbers, citations, countries, institutions, authors, journals, references, and keywords. Results We found 6,016 original articles on the application of DL in cancer. The number of annual publications and total citations were uptrend in general. China published the greatest number of articles, USA had the highest total citations, and Saudi Arabia had the highest centrality. Chinese Academy of Sciences was the most productive institution. Tian, Jie published the greatest number of articles, while He Kaiming was the most co-cited author. IEEE Access was the most popular journal. The analysis of references and keywords showed that DL was mainly used for the prediction, detection, classification and diagnosis of breast cancer, lung cancer, and skin cancer. Conclusions Overall, the number of articles on the application of DL in cancer is gradually increasing. In the future, further expanding and improving the application scope and accuracy of DL applications, and integrating DL with protein prediction, genomics and cancer research may be the research trends.


Introduction
Artificial intelligence (AI), an important branch of computer science, involves algorithms capable of analyzing complex data, which was first introduced by McCarthy in 1956 [1].AI has experienced rapid development from machine learning (ML) to deep learning (DL) [2,3].DL, a sub-branch of AI and ML, was first introduced by Hinton in 2006 [4].In 2012, Krichevsky designed a new ImageNet in the ILSVRC-2012 competition, and won the first place with an error rate nearly 10% lower than the second place, marking the entry of AI into a new phase of DL [5].DL forms complex layers through layer-by-layer training, using the upper layer's training result as an initialization parameter for the lower layer training process, thereby obtaining more representative feature data [6][7][8].Currently, commonly used algorithms for DL include convolutional neural networks (CNNs) and recurrent neural networks (RNNs) [9].To date, DL has made outstanding progress in computer vision, speech recognition, natural language processing, and biomedicine [9][10][11][12].In biomedicine, the application of DL spans electronic information file management, medical imaging, disease analysis, genomics, and robotic-assisted surgery [13][14][15].
Cancer remains a leading cause of death in the world, with its incidence increasing annually and affecting younger populations.The extensive research on DL has led to the wide application of DL in cancer prediction, detection, classification, diagnosis, and prognosis, particularly due to its significant advantages in medical imaging.At present, DL has been applied to various cancers including breast cancer, skin cancer, lung cancer, prostate cancer, cervical cancer, gastric cancer and colorectal cancer [16][17][18][19][20].However, despite the application of DL in cancer has achieved some achievements, there are still challenges.The application scope, accuracy, and optimal algorithms of DL still need to be further explored and improved [21,22].Therefore, it is necessary and important to conduct a bibliometric analysis to summarize the current research status and hotspots, which will further strengthen the research on the application of DL in cancer.
Bibliometric analysis uses mathematical and statistical methods to quantitatively analyze the publications in a field, and can explore research status, hotspots, and trends through co-occurrence analysis, cluster analysis, timeline graph, and burst detection.To our knowledge, bibliometric analysis has been used in various fields, including the application of DL in specific cancer types such as breast cancer, lung cancer, colorectal cancer and gastrointestinal cancer [23][24][25].However, a bibliometric analysis on the application of DL across all cancer types at an overall level has not yet been conducted.To address this gap, we planned to perform a bibliometric analysis of the application of DL in all cancer types, followed by specific analyses of individual cancer types.Therefore, in this study, we aimed to explore the research status and hotspots of the application of DL in cancer through bibliometric analysis, providing researchers with landmark articles and key topics, high-impact institutions and influential authors, and even inspire some new inspiration.More importantly, we hoped to reveal which cancer areas have received more attention and which cancer areas have been overlooked at the overall level, so as to provide directions for subsequent research.

Data source and search strategy
We retrieved the articles on the application of DL in cancer form the Web of Science Core Collection (WoSCC) database.While other databases, such as PubMed, Scopus, and Google Scholar are available, the WoSCC database offers several advantages.The WoSCC database is the largest scientific citation database in the world, known for its extensive coverage of scholarly literature across all disciplines, including biomedical sciences, while covering a variety of journal types such as peerreviewed journals, conference proceedings, and scholarly publications.The WoSCC database is also recognized for its rigorous selection criteria and quality control measures, ensuring reputable and high-impact article source.In addition, the WoSCC database provides standardized metadata and indexing terminology to facilitate systematic data retrieval and analysis.Therefore, we selected the WoSCC database for our literature search.To avoid the bias due to characteristic of daily updating of the WoSCC database, we completed the literature searches on 16 September 2023.Meanwhile, to comprehensively capture the latest articles and better explore the research trends and hotspots, we included some articles with a publication date later than the search date, mainly including some early access.The specific search strategy was detailed in Fig. 1: First, the title, abstract, or author keywords included "deep learning" and "cancer".Then, without limiting the timespan, we retrieved all the articles up to 16 September 2023.The document type included only original articles, excluding retracted articles.Only articles in English were included.Two researchers independently examined the title, abstract, and author keywords of each article to determine its relevance to DL and cancer, excluding non-medical uses or irrelevant articles.In cases of disagreement between the two researchers, a third person made the final decision.Finally, we found 6,016 relevant original articles from the WoSCC database, and no duplicate articles were found by the deduplication from CiteSpace.

Bibliometric and visualization analysis
We exported all records of the above 6016 related articles in plain text files and Excel forms for bibliometric and visualization analysis.We extracted information such as numbers, citations, countries, institutions, authors, journals, references, and keywords.In our study, the analysis of numbers, citations, countries, institutions, authors, journals, and references was based on the extracted raw data.For the analysis of keywords, we merged the original keywords with their respective synonyms to ensure consistency.Then, we conducted bibliometric analysis using the Bibliometric Analysis Platform (bibliometric.com), Biblioshiny, VOSviewer (VOSviewer_1.6.18) and CiteSpace (CiteSpace_6.2.R4).During the analysis, the column and line charts were used to analyze the trends of annual publications and total citations.The Bibliometric Analysis Platform and Biblioshiny mapped publication output in two different forms.VOSviewer and CiteSpace, the two main software that used for bibliometric analysis, were used to conduct co-occurrence analysis, cluster analysis, co-cited analysis, timeline graph, and burst detection.In visualization maps, each node represents a country, institution, author, journal, reference, or keyword.The lines between nodes represent cooperative relationships between the elements, the thicker the line, the closer the cooperative relationships between them.The purple ring on the outside of the node represents centrality, and centrality above 0.1 is considered as high centrality, indicating the central node and high influential.In addition, we obtained the IF 2022 and JCR division data form the Journal Citation Reports.

The general global trends
The number of publications and total citations reflect the development and growing interest in the application of DL in cancer research.We found a total of 6,016 original articles on the application of DL in cancer.From 2015 to 2023, there was a rapid growth in both the number of publications and total citations.As shown in Fig. 2, the number of articles increased from 5 in 2015 to 1,830 in 2022, while total citations increased from 2 in 2015 to 37,045 in 2022, indicating a significant increasing interest in the application of DL in cancer globally.The development stage was roughly divided into three stages: early stage (2015), growth stage (2016-2021), and prosperity stage (2022-2023).There were 1,557 articles and 28,151 total citations in the first nine months of 2023.Based on this data, we forecasted that the total number of articles and total citations in 2023 will continue to grow and eventually surpass those in 2022.

Analysis of countries
112 countries/regions published relevant articles on the application of DL in cancer.Table 1 listed the top ten countries by publication volume.More than half of these articles published by China and the USA (57.83%).China was the most productive country with 2,066 articles, followed by USA (1,413), India (676), South Korea (442), and Saudi Arabia (346).USA had the highest total citations (46,820), followed by China (31,072), Netherlands (12,684), England (10,992) and Germany (8,639).Next, we conducted a visualization analysis of the countries.Figure 3a showed the countries/regions that have published articles in blue, and indicated the number of articles by the depth of blue.The pink lines represent the cooperative relationships between countries.Figure 3b also showed the cooperation of countries, with different colored areas representing different countries, region sizes representing the number of articles, and lines representing cooperative relationships.Figure 3c and d was formed using VOSviewer and CiteSpace, respectively.In Fig. 3c, 58 countries/regions were divided into five clusters when the minimum number of a document of a country was ten.In Fig. 3d, Saudi Arabia (0.22), England (0.16), India (0.13) and Pakistan (0.13) showed high centrality, indicating that these countries played more significant roles in the development of the application of DL in

Analysis of institutions
6,417 institutions published relevant articles on the application of DL in cancer.Table 2 listed the top ten institutions by publication volume.Chinese Academy of Sciences published the greatest number of articles (207), followed by University of Texas System (174), Egyptian Knowledge Bank (151), Sun Yat Sen University (144) and Shanghai Jiao Tong University (135).Interestingly, the top ten institutions only affiliated three countries, with five from China, four from USA, and one from Egypt.Subsequently, the visualization analysis of institutions was performed.The active cooperation relationships between the different institutions were shown in Fig. 4a.However, only Radboud University Nijmegen (centrality = 0.1, from Netherlands) exhibited high centrality, none of the top ten institutions mentioned above showed high centrality.Figure 4b showed the cluster analysis of institutions and the cluster was significant and convincing (Q = 0.53, S = 0.86.It was generally thought that Q > 0.3 meant the cluster structure was significant, S > 0.5 meant clustering was reasonable, and S > 0.7 was convincing.).The seven clusters were #0 multicenter study; #1 chest radiograph; #2 diagnostic assessment; #3 superior skin cancer classification; #4 breast cancer detection; #5 reader study; #6 did not display an obvious cluster label.

Analysis of authors
28,979 authors contributed to these 6,016 articles.The top ten authors by publication volume were listed in Table 2. Tian, Jie published the greatest number of articles (39), followed by Wang, Jing (27), Wang, Wei (27), Lei, Yang (26) and Liu, Tian (26).Tian, Jie also had the highest total citations (1,008), but Khan, Muhammad Attique had the highest mean citations (39.13).Figure 5a showed the visualization analysis of authors.75 authors were divided into ten clusters when the minimum number of a document of an author was ten.But in fact, 108 authors published more than ten articles.This discrepancy was because some authors were not connected to each other, indicating a relative lack of cooperation relationships between authors.In addition, the co-citation of authors was also analyzed in Fig. 5b.The co-citation meant the authors, journals, or references of two or more articles were cited by another article at the same time.499 co-cited authors were divided into five cluster when the minimum of citations of an author was fifty, and He Kaiming ranked first with 1,201 times co-citations.

Analysis of journals
These 6,016 articles were distributed across 821 journals.).These journals included not only medical, but also included physics, computer science, and biomedical imaging.The visualization analysis of journals was performed.Figure 6a showed that 220 journals were divided into ten clusters when the minimum of documents of a journal was five. Figure 6b showed the dual-map overlay of journals generated by Citespace, providing a comprehensive view of the temporal and interdisciplinary evolution of the applications of DL in cancer, underscoring the dynamic and interconnected nature of this field.This visualization depicted two distinct datasets, with the left side representing earlier research publications and the right side corresponding to more recent publications.The left side captured the initial integration of DL across various subject areas, reflecting early theoretical foundations, clinical applications, and molecular research that laid the foundation for subsequent advances, such as "Mathematics, Systems, Mathematical" (Cluster 1), "Medicine, Medical, Clinical" (Cluster 2), and "Molecular Biology, Immunology" (Cluster 4).On the right side, it illustrated the evolution and current state of the applications of DL in cancer.Significant clusters included "Systems, Computing, Computer" (Cluster 1), highlighting advanced computational techniques and system-level analyses; "Health, Nursing, Medicine" (Cluster 5), focusing on the clinical applications and healthcare implications of DL; and "Molecular Biology, Genetics" (Cluster 8), delving into genetic research and its integration with DL technologies.

Analysis of references
The times of citations can reflect the influence of an article, the more citations, the more important it was considered.Table 4 listed the top ten most cited articles.The most cited article was "Computational Radiomics System to Decode the Radiographic Phenotype" published in 2017 by Griethuysen, which has been cited 2,570 times.In addition, the co-citation of references was also an important indicator to reflect the impact of an article and the basis of the research.Interesting, the article published by Coudray entitled "Classification and mutation prediction from non-small cell lung cancer histopathology images using deep learning" was both one of the top ten cited article and one of the top ten co-cited reference.Then, the visualization map of co-citation of references was shown in Fig. 7a, where the references were divided into six clusters.The timeline graph of references was in Fig. 7b, which clustered references and spread them out in chronological order, showing the change of cluster over time.From Fig. 7b, we can identify the most co-cited references (with larger nodes), references with high centrality (purple rings on the outside of the node), and the clustering label.The seven clusters were: #0 mitosis detection; #1 microsatellite instability; #2 polyp segmentation; #3 skin cancer; #4 lung cancer; #5 breast cancer diagnosis; #6 breast cancer classification.

Analysis of keywords
Keywords can directly express the topic of an article, and analysis of keywords can reveal the research hotspots and trends in a certain field.After extracting and merging the keywords, the top thirty keywords with the most frequency were listed in Table 6."Deep learning" was the most frequent keyword, followed by "convolution neural network", "breast cancer", "artificial intelligence", "machine learning", "lung cancer", "cancer", "transfer learning", "computed tomography", "classification".Among these keywords, six keywords were directly related to cancer: "breast cancer", "lung cancer", "prostate cancer", "skin cancer", "cervical cancer", and "colorectal cancer".Then, the visualization analysis was performed using VOSviewer.The network visualization map (Fig. 8a) showed 276 keywords were divided into nine clusters when the minimum number of occurrences of a keyword was ten.The red cluster including "deep learning" was  the largest cluster, with 78 keywords.The overlay visualization map (Fig. 8b) added the time factor into the analysis, with lighter colors indicating earlier occurrences and redder colors indicating later occurrences.It is evident that DL has been studied earlier in breast cancer, skin cancer, and lung cancer, while colorectal cancer and oral cancer have been studied relatively late.The visualization analysis was also performed using CiteSpace.The timeline graph (Fig. 8c) clustered keywords and expanded them in chronological order to show the change of hotspots and the process of development.The six clusters were #0 deep learning; #1 breast cancer; #2 cervical cancer; #3 convolutional neural network; #4 lung cancer; #5 thyroid cancer.The burst detection was shown in Fig. 8d, where listed the top twenty keywords with the strongest citation bursts."Computer aided detection" was the keyword with the strongest citation bursts appearing in 2015."Predictive models", "resection", and "protein" were among the recent keywords with stronger citation bursts.

Discussion
Recently, DL has attracted much attention from the academic community.By building different various models and algorithms, DL has been applied to the prediction, detection, classification, diagnosis, prognosis of cancer, and the discovery of cancer biomarkers, achieving accuracy comparable or even higher than that of clinicians [26,27].The application of DL in cancer has not only continuously improved medical diagnosis and medical quality, but also promoted the development of precision medicine [28].However, with the increasing application of DL in cancer, it is important to understand its current research status and identify the emerging research hotspots.Therefore, we conducted a bibliometric analysis to provide researchers with introductory guidance, an overview of the research status and hotspots and new inspiration of the application of DL in cancer.Overall, from 2015 to 2023, the number of publications on the application of DL in cancer has increased year by year, and in 2022 it entered a prosperity stage.China, USA, and India are the top three countries that have published articles on the application of DL in cancer, meanwhile China and USA are also the main sources of the top ten institutions, indicating their significant contribution to this field.As one of the most developed country in the world, USA has shown unique advantages in many fields, the rapid development of China in recent years is also well recognized.At the same time, both China and USA proposed relevant strategies to strengthen the development of AI, so it is not surprising that China and USA have performed well in the application of DL in cancer.But why is India in third place?This can be attributed to the high priority of Indian government on AI.The Indian government released "Digital India Strategy" in 2015 and "National Strategy for Artificial Intelligence" in 2018.In addition to drawing up a blueprint at strategic level, the Indian government has invested heavily in supporting the development of AI [29][30][31][32].This series of measures has enabled India to develop rapidly in AI, including DL.Therefore, to further promote the application of DL in cancer, the support of government policy and financial are very important.
In addition, the cooperation relationships between countries and institutions are extensive.China and USA are the countries with the closest cooperation, and they also cooperate most extensively with other countries.From the cluster analysis of institutions, it can be seen that breast cancer and skin cancer are the cancers that are studied more collaboratively across institutions, and their research is mainly on the diagnosis, classification and detection of cancer.However, the cooperation relationships between authors are relatively lacking.We all known that the identity of authors includes doctors and scientists.Because of their different identities, the perspective of the same problem may also be different, and further exploring the collaboration between doctors and scientists may bring us more surprises.But unfortunately, the lack of cooperation between authors and corresponding data support, this study is very difficult and requires further efforts.In short, cooperation is one of the effective ways to achieve breakthroughs and winwin, although some achievements have been made in the application of DL in cancer, more extensive and in-depth cooperation is still needed.
Analysis of journals shows that the top ten journals cover medicine, computer science, and biomedicine, while medical journals are mainly concentrated in the fields of oncology and medical imaging.This gives researchers a preliminary impression of the application of DL in cancer: DL is a subfield of ML, the application of DL in cancer is an interdisciplinary field involving medicine and computer science.The application of DL in cancer builds on earlier research in mathematics, computer science, and molecular biology, utilizing complex algorithms such as CNNS and RNNS to play an important role in the diagnosis, prediction, prognosis assessment, discovery of new biomarkers of modern medicine.At the same time, analysis of journals provides researchers with follow-up research direction and the selection of journals.Researchers can determine their research priorities based on the thematic direction of high-impact journals and select appropriate journals for submission.In addition, the interdisciplinary landscape displayed in dual-map overlay of journals reveals major applications of DL in cancer: 1) Tumor detection and classification: using DL technology to detect and classify tumors early and improve diagnostic accuracy.2) Medical imaging: using DL technology in medical imaging technology such as CT and MRI to achieve more accurately identify the lesion.3) Cancer prognosis prediction: using DL technology to predict the progression and prognosis of cancer by analyzing clinical data and genetic information of patients.4) Biomarker discovery: using DL technology to discover new cancer biomarkers and promote the development of precision medicine [33][34][35][36].
Co-citation of references is a reliable indicator to indicate the research basis, which can identify the landmark references and the evolution of research topics.In this study, the most cited reference is the "ImageNet Classification with Deep Convolutional Neural Networks" authored by Krichevsky [5].In 2012, Krichevsky won the first place in the ILSVRC-2012 competition, which marked the arrival of the era of DL and laid the foundation for the further application of DL.Further analysis of cluster analysis of co-cited references, which indicates the evolution of the application of DL in cancer.In #0 "mitosis detection" cluster, researchers proposed different DL models for mitotic detection of breast cancer.In 2016, Albarqouni proposed an additional crowdsourcing layer (AggNet) for mitosis of breast cancer histological images, the data aggregation is processed directly through the AggNet and as part of CNNs [37].In 2018, Li proposed a multi-stage DL framework to accurately detect mitotic cells in pathological sections [38].Next, as shown in #5 "breast cancer diagnosis" and #6 "breast cancer classification" clusters, more and more DL models were applied to the diagnosis and classification of the breast cancer.In 2019, Ragab proposed a new computer aided detection (CAD) systema for the classification of benign and malignant breast mass.The CAD system used two segmentation methods and achieved the highest area under the curve compared to the previous ones [39].Shen also proposed a DL algorithm in 2019 for breast cancer diagnosis, which used a DL algorithm with an "end-to-end" training method, reducing the reliance on rarely available lesion annotations [40].In 2020, Liu applied a DL method based on Bilinear Convolutional Neural Networks to finegrained classification of breast cancer and achieved an accuracy rate of more than 95% [41].At the same time, different DL algorithms are also used for the classification, prediction, detection, diagnosis of skin cancer and lung cancer [42][43][44][45].Recently, DL algorithms have even been used to predict genetic mutations.In 2021, a multichannel and multi-task DL model proposed by Dong was used to predict EGFR and KRAS mutations in non-small cell lung cancer, with a prediction accuracy of about 70% [46].
Keywords are important index to reflect the research topic.The frequency of keywords can reflect the current research status and hotspots, while the burst detection of keyword can reflect the evolution of research.In our study, by analyzing the burst detection of keywords, we notice that the earliest burst keyword is "convolutional neural network".CNNs is a class of DL models specifically designed to process data with a grid structure, it is mainly composed of convolutional layer, activation function, pooling layer and fully connected layer.Because of its automatic feature extraction, parameter sharing and spatial invariance, CNNs is widely used in various image processing tasks and in DL [47,48].Other common used DL networks and reasoning models also include RNNs, Generative Adversarial Networks (GANs), Variational Autoencoders (VAEs) [49,50].Besides, other keywords are related to imaging, pathology, and specific cancer names.Therefore, we concluded that the application of DL in cancer is mainly related to imaging.Combined with radiomics and DL, DL models are used for cancer prediction, detection, classification, diagnosis, and prognosis [51].For example, Paul used DL to predict the benign and malignant pulmonary nodules [52], Heuvelmans retrospectively verified the accuracy of DL in identify the benign and malignant pulmonary nodules, confirming that DL can be used as an effective tool for classifying and differentiating pulmonary malignant nodules [53].In addition, analysis of keywords shows that the application of DL in breast cancer, skin cancer, and lung cancer has been relatively mature, while the application of oral cancer and thyroid cancer has been some study [54,55], but it is still in its infancy.The burst detection of keywords can find the keywords with strongest citation bursts in a certain period of time, and indicate research hotspots and trends.The application of DL in cancer has experienced early research on DL models and algorithms.With the gradual maturity of various algorithms, DL technology has begun to be applied in practice, various DL algorithms have been widely used in the diagnosis, classification, and prediction of lung nodules and breast masses.In 2023, the main keywords with strongest citation bursts are "predictive models", "resection", and "protein".This indicates that in addition to further expanding the application scope of and accuracy of DL models, protein structure prediction and genomics based on DL will be another research hotspots [56][57][58].To sum up, based on our research, we summarized the application of DL in cancer as follows: first, to achieve early detection and diagnosis of cancer in combination with medical imaging technology; second, to perform prognostic analysis based on clinical data and genetic data; third, to improve the efficiency and accuracy of image processing by using automatic image segmentation and processing; fourth, to discover new cancer biomarkers through extensive biological data and promote the development of precision medicine.In the future, the application of DL in cancer is to integrate DL, protein prediction, genomics and cancer through interdisciplinary cooperation to further realize precision medicine [59].
However, this study still had some limitations.First, the search process may have led to the omission of some important articles.This omission could be attributed to two main reasons.Firstly, DL is a sub-branch of AI and ML, and some AI and ML articles may include studies related to DL.Since we aimed to analyze this small subbranch of DL, some relevant articles may have been inadvertently excluded.Secondly, while the WoSCC database is a large and comprehensive citation database, it may still miss some important articles that only included in other databases.Second, the study included only English-language articles, but some important non-English literatures may have been overlooked.Finally, bibliometric analysis is a descriptive study that only analyzes the current state of research at a specific time.But medical science is constantly evolving, various new articles are published every day, so time constraints should be taken into account when analyzing.Therefore, it is important to acknowledge that new and constantly improving research is still needed in the future to compensate for the current limitations.

Conclusion
In this study, we used bibliometric analysis to explore the research basis, research status, research hotspots and future research trends of DL in cancer.Overall, the application of DL in cancer is a highly promising research area that has attracted the interest of many researchers in recent years.Presently, DL has been widely used in the prediction, detection, classification, diagnosis and prognosis of breast cancer, lung cancer, skin cancer, while the application of oral cancer and thyroid cancer is still in its infancy.In the future, further expanding the application scope of DL and improving the accuracy of DL models will be hotspots.At the same time, integrating DL with protein prediction, genomics and cancer will be another future research trends.Continuous advancements in these areas will further enhance the capabilities and impact of DL in cancer research.

Fig. 1
Fig. 1 The flowchart of the specific search strategy of the application of deep learning in cancer from the Web of Science Core Collection database

Fig. 2
Fig. 2 The annual change trends in the number of articles and total citations of application of deep learning in cancer from 2015 to 2023

Fig. 3
Fig. 3 The visualization analysis of countries.a The map of country distribution.b The cooperation relationships map of countries.c The network visualization map of countries.d The visualization map of countries.Each node represents a country/region

Fig. 4
Fig. 4 The visualization analysis of institutions.a The cooperation relationships network of institutions.b The cluster analysis of institutions

Fig. 6
Fig. 6 The visualization analysis of journals.a The visualization analysis of journals.b The analysis of the dual-map overlay of journals

Fig. 7
Fig. 7 The visualization analysis of references.a The visualization analysis of co-cited of references.b The timeline graph of references

Fig. 8
Fig. 8 The visualization analysis of keywords.a The network visualization map of keywords.b The overlay visualization map of keywords.c The timeline graph of keywords.(Dd) The top twenty keywords with the strongest citation bursts

Table 1
The top ten countries by volume of the application of deep learning in cancer

Table 2 The
top ten institutions and authors by volume of the application of deep learning in cancer

Table 3
Table 5 listed the top ten co-cited references.The most co-cited reference was "ImageNet Classification with Deep Convolutional Neural Network" published in 2017 by Krizhevsky, with 565 co-citations.

Table 3
The top ten journals by volume of the application of deep learning in cancer

Table 4
The top ten most cited articles of the application of deep learning in cancer

Table 5
The top ten co-cited references of the application of deep learning in cancer